10973815 Posted February 27, 2019 Share Posted February 27, 2019 I was doing some testing tonight with my minox developing tank to test agitation/flow methods following my color developing experience and the seemingly undeveloped upper shots. I left the lid off and dropped the helix in, raised off the bottom slightly. A piece of white tape was stuck inside the tank in the area where the cassette would sit for visual contrast. I filled the tank with 60cc of water and added 3 drops of food coloring to the fill port. I applied the various methods, running a timer for 3.5 mins (C41 developing time) until I saw the red coloring appear over the white tape. Thermometer pumping: no color appeared after 3.5 minutes 5cc medicine dropper pump: no color after 3.5 mins Setting the tank on a vibrating neck massager on high: after 1:09 a steady bleed of color that continued until 3:30 20cc syringe with long, large needle pumping 10cc: after 2nd pump a burst of red, with a fresh burst after each pump. I then machined 4 1mm deep grooves down each side of the helix and tried again. 20cc pumping 10cc: color burst after 1 pump and steady bursts after 20cc pumping 5cc: same color results as if pumping 10cc without the grooves, but with much less change in tank volume or overflow risk. I didn't try the thermometer or medicine dropper with the grooves since the syringe was working so well and was much easier. I also did not try the massager again since it would be difficult to maintain developing temperature while using it. In the future I may add more grooves and will use the large syringe for my next development, I'm excited to see the results. Link to comment Share on other sites More sharing options...
B. C. S. Posted February 27, 2019 Share Posted February 27, 2019 Yes, let us know the results. I'm surprised at how poor the conventional agitation with the thermometer is. Link to comment Share on other sites More sharing options...
jeffpolaski Posted January 22, 2020 Share Posted January 22, 2020 I never used the thermometer, having heard of them breaking during agitation. I've used the handles of plastic chopsticks. The square handles allowed me to spin the agitator while pumping it. Vibrating things weren't easily available in 1970-71. Link to comment Share on other sites More sharing options...
millard_thomas1 Posted January 27, 2020 Share Posted January 27, 2020 I was doing some testing tonight with my minox developing tank to test agitation/flow methods following my color developing experience and the seemingly undeveloped upper shots. I left the lid off and dropped the helix in, raised off the bottom slightly. A piece of white tape was stuck inside the tank in the area where the cassette would sit for visual contrast. I filled the tank with 60cc of water and added 3 drops of food coloring to the fill port. I applied the various methods, running a timer for 3.5 mins (C41 developing time) until I saw the red coloring appear over the white tape. Thermometer pumping: no color appeared after 3.5 minutes 5cc medicine dropper pump: no color after 3.5 mins Setting the tank on a vibrating neck massager on high: after 1:09 a steady bleed of color that continued until 3:30 20cc syringe with long, large needle pumping 10cc: after 2nd pump a burst of red, with a fresh burst after each pump. I then machined 4 1mm deep grooves down each side of the helix and tried again. 20cc pumping 10cc: color burst after 1 pump and steady bursts after 20cc pumping 5cc: same color results as if pumping 10cc without the grooves, but with much less change in tank volume or overflow risk. I didn't try the thermometer or medicine dropper with the grooves since the syringe was working so well and was much easier. I also did not try the massager again since it would be difficult to maintain developing temperature while using it. In the future I may add more grooves and will use the large syringe for my next development, I'm excited to see the results. This is fascinating. I know too little about color processing even to ask intelligent questions. But I'm very eager to hear more. Thank you, Marc Link to comment Share on other sites More sharing options...
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